Saturday 20 August 2011

Bio2 : Stages of Mitosis



4 stages of mitosis :

a* Prophase : The chromatin, diffuse in interphase,condenses into chromosomes. Each chromosome  has duplicated and now consists of two sister chromatids. At the end of  prophase, the nuclear envelope breaks down into vesicles.

b* Metaphase : The chromosomes align atthe equatorial in place by microtubles attachment plate and are held in place by microtubes attached to the microtic spindle and to the centromere.

c* Anaphase : The centromeres divide. Sister chromatids separate and move toward the coressponding poles.

d* Telophase : Daughter chromosomes arrive at the poles and the microtubes disappear. The condensed chromatin expands and the nuclear envelope reappears. The cytoplasm divides, the cell membrane pinches inward ultimately producing two daughter cells (phase : Cytokinesis)


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